Fahmi Ben Khalifa.

FULL-STACK · CYBERSECURITY · AI - BERLIN, DE

New ways to build,new ways to ship.

I'm Fahmi, a senior engineer moving deeper into cybersecurity and AI. A decade shipping React Native apps and resilient backends, now building secure, intelligent systems from the ground up.

SCROLLAVAILABLE FOR FREELANCE · 2026
FAHMI BEN KHALIFAFULL-STACK DEVELOPERBERLIN

(01) WHO I AM

I turn complex systems into clean, shippable products.

Over the last decade I've led React Native and Node.js work across live commerce, fintech and AI. I co-founded and served as CTO of Aurax through to a successful exit, and today I'm building at Gavel (YC W22).

I care about code quality, pragmatic architecture and thinking outside the box, with a penetration-testing background that keeps security front of mind.

BASED
Berlin, Germany
EXPERIENCE
10+ years
FOCUS
Mobile · Web · AI
FREELANCE
Available
LANGUAGES
EN · FR · AR
10+
YEARS EXPERIENCE
40+
PROJECTS SHIPPED
4
HACKATHON AWARDS
1
STARTUP EXIT

(02) SELECTED WORK

05 PROJECTS

(03) CAREER LOG


  1. — NOW

    Senior Full Stack Developer

    Gavel GmbH · YC W22

    RESTful services in NodeJS/NestJS, ReactJS & React Native product work, and AI features — image classification, object detection and LLMs (PyTorch, HF).


  2. —

    Co-Founder & CTO

    Aurax · Exit 2022

    Led a team of 4 engineers, architected NodeJS micro-services, automated CI/CD with GitLab & Docker, and monitored with Prometheus & Grafana. Exited April 2022.


  3. —

    Penetration Tester

    SIFARIS Tunisie

    Security assessments and penetration-testing engagements across client systems.

STACK

  • React Native
  • Typescript
  • NodeJS
  • ReactJS
  • Next.js
  • MongoDB
  • Python
  • PyTorch
  • Docker
  • ELK Stack
  • C/C++

AWARDS

  • 1st Prize — Tunisia Hackfest 2K172017
  • 1st Prize — Tunisia Hackfest 2K162016
  • 2nd Prize — Risks[S] Solution2016
  • 2nd Prize — Esprit Hack Days2016

(04) JOURNAL

Writing & engineering notes.

ALL POSTS →

(05) TESTIMONIALS

People I've built with.

“Fahmi is the rare engineer who ships fast without cutting corners on security. He rebuilt our realtime auction stack and it just worked — under real load, on day one.”

Product Lead · Gavel

“As CTO he set the engineering bar for the whole company. Clean architecture, calm under pressure, and a mentor to every junior on the team.”

Co-Founder · Aurax

“His pentest background shows in everything he builds — he thinks about failure modes most devs never even consider.”

Security Lead · SIFARIS

“We shipped LLM features to production in weeks, not quarters. Fahmi bridges research and real product better than anyone I've worked with.”

Eng Manager · Gavel